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A376967 as a simple table

na(n)
10
20
30
41
52
65
717
849
9138
10374
111062
122851
138010
1421432
1560142
16161386
17453253
181222110
193436564
209316409
2126231463
2271496106

[0,0,0,1,2,5,17,49,138,374,1062,2851,8010,21432,
 60142,161386,453253,1222110,3436564,9316409,
 26231463,71496106]